M112K 3.2L Supercharged V6 — C32 AMG & SLK32 AMG
The M112K is the AMG-built, supercharged 3.2-litre V6 fitted to the C32 AMG and SLK32 AMG. It uses a twin-screw supercharger running roughly 1.0 bar on the factory clutched 74mm pulley, fed through a water-to-air intercooler with a small heat exchanger under the bumper and its own electric pump. Factory rating is 349 hp and 332 lb-ft.
That layout is the whole story of this platform. Boost is set by pulley size, and the limit on how much of it you can keep is the cooling loop. Everything in this collection works one of those two levers — or feeds the engine enough fuel and air to use what you have gained.
- Supercharger pulleys
- Custom ECU tuning
- Cooling pump & catch can
- Shorty headers
- 630cc injectors
- E85 flex-fuel
- Camshafts
- K&N drop-in filters
- 722.6 valve body
Fitment
| Chassis |
Model |
Years |
Engine |
| W203 / S203 / CL203 |
C32 AMG |
2001–2004 |
M112K 3.2L supercharged V6 |
| R170 |
SLK32 AMG |
2001–2004 |
M112K 3.2L supercharged V6 |
| ZH |
Chrysler Crossfire SRT-6 |
2005 on |
M112K 3.2L supercharged V6 |
The Crossfire SRT-6 uses the same AMG supercharged 3.2 on R170 underpinnings, so several parts here carry over — but not all of them. Coverage is stated on each listing. If a listing does not name your car, ask before you order rather than assuming.
Where the gains actually come from
Pulley — clutched or clutch-delete
A smaller supercharger pulley spins the blower faster and raises boost. The factory unit is clutch-activated; a clutch-delete pulley removes that engagement stage entirely. They are different parts with different behaviour, and both are listed separately here — read each one before choosing.
Cooling — the real ceiling
The intercooler loop on these cars is small and heat-soaks quickly under repeated load. A higher-flow circulation pump moves more coolant through it, which is why cooling parts sit alongside pulleys rather than after them.
Fuel — injectors and E85
More boost needs more fuel. 630cc injectors and the flex-fuel conversion exist to keep the mixture where it should be once the pulley is done, and E85 brings knock resistance the pump-gas calibration cannot.
Calibration — ties it together
Hardware without a matching tune leaves the factory fuel and timing tables guessing. Custom ECU tuning is what makes the pulley, injectors and fuel choice behave as one package.
Before you order: C32 and SLK32 parts are not always shared, and Crossfire SRT-6 coverage varies part by part. Send your year, model and VIN through
part sourcing and we will confirm fitment first.
Related platforms
Engine and application data cross-checked against Mercedes-Benz M112 / R170 / W203 factory specification references and independent model registries.
